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2 years ago

Verify cos^4x-sin^4x=cos2x

1 answer:

kati45 [8]2 years ago

7 0

A^2 - b^2 = (a - b)( a +b);
<span>cos^4x-sin^4x =( cos^2x + sin^2x )( cos^2x - sin^2x) = 1* cos2x = co2x.</span>

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Step-by-step explanation:

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